What were the causes of the Harrying of the North?
> Edwin, Morcar and Edgar the Aetheling fled north and Edgar made a claim on William's throne
> King Malcolm of Scotland (who had married Edgar's sister) supported this claim
> A Norman earl was murdered by English rebels and a bishop's house was set on fire
> Edgar attacked the city of York
> Viking ships came to England and joined Edgar's army
> This army took control of York Castle